Fan Blade Core Thermal Spray Coating for Adhesion Prevention
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Solution Overview
Problem
Existing methods for manufacturing leading edges of Organic Matrix Composite (OMC) fan blades face challenges in thermomechanical non-deformability, chemical neutrality, and adhesion prevention between nickel-based or cobalt-based cores and titanium alloys during high-temperature shaping, leading to contamination and degradation issues.
Innovation Solution
A process involving a nickel base alloy core with a thermally sprayed cobalt base alloy layer, including molybdenum, chromium, and silicon, providing a chemical inertia and anti-diffusion barrier, and subsequent heat treatment and machining steps to ensure stability and prevent adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a nickel-based or cobalt-based alloy core is used for thermomechanical stability at high temperature, then the core maintains its shape during shaping, but the core material reacts chemically with titanium alloy leading to contamination and adhesion
Solution Approach 1:
A refractory coating layer is applied to the surface of the nickel-based or cobalt-based alloy core. This coating acts as an intermediary barrier that prevents direct chemical contact between the core material and the titanium alloy sheets, thereby eliminating contamination and adhesion while preserving the core's thermomechanical stability.
Solution Approach 2:
The core is constructed as a composite structure combining a nickel-based or cobalt-based alloy substrate with a refractory coating layer. This composite design integrates the high-temperature strength of the metal alloy with the chemical inertness of the refractory material, achieving both thermomechanical stability and chemical neutrality.
2Productivity
If the core is reused multiple times for cost reduction, then manufacturing economy improves, but the anti-diffusion barrier degrades after first compaction cycle
Solution Approach 1:
The refractory coating is designed as a sacrificial protective layer that can be easily reapplied. After each use cycle, if the coating shows signs of degradation, it can be removed and a fresh coating applied to the core, restoring the anti-diffusion barrier functionality and enabling continued reuse.
Solution Approach 2:
The refractory coating is applied in advance to the core before the compaction process. This preliminary protective action ensures the anti-diffusion barrier is in place before any chemical reactions can occur, and the coating can be maintained through periodic reapplication throughout the core's service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process achieves thermomechanical stability, prevents chemical contamination, and avoids adhesion, enabling the reuse of cores and reducing manufacturing costs by creating a robust anti-diffusion barrier.
Implementation Method 1
A process for the manufacture of a core for the production of a leading edge of a fan blade, in which a nickel base alloy core is covered with a layer of a cobalt base alloy, comprising chromium and at least one element among tungsten and/or molybdenum, by thermal spraying and characterized in that the layer guarantees a chemical inertia making it possible to produce an anti-diffusion barrier between the nickel base alloy core and the metal sheets which undergo thermomechanical treatment for many hours at high temperature
Implementation Method 2
covering said core with a layer of a cobalt base alloy by thermal spraying
Data Source
Figure 1~2
AI summary
The invention relates to a method for manufacturing a core (1) for producing a leading edge of a fan blade. The method comprises the steps of: (a) providing an initial core (11) made of a nickel-base alloy, (b) thermal spraying of a layer (12) of a cobalt-base alloy, comprising chromium and at least one element of tungsten and/or molybdenum, on the initial core.